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(D) Let's analyze each option:$A$: For $3$-nitroprop-$2$-enal,the cis-isomer has a higher dipole moment because the bond dipoles of the $CHO$ and $NO_

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The melting point of cis$-1,2-$difluoroethene is greater than that of trans$-1,2-$difluoroethene.

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(D) Let's analyze each option:$A$: For $3$-nitroprop-$2$-enal,the cis-isomer has a higher dipole moment because the bond dipoles of the $CHO$ and $NO_2$ groups are oriented in the same direction,whereas in the trans-isomer,they partially cancel out. Thus,the given order is incorrect.$B$: The boiling point of the cis-isomer is generally higher than the trans-isomer due to higher polarity. The given order is incorrect.$C$: The heat of combustion is higher for the less stable isomer. Cis-but-$2$-ene is less stable than trans-but-$2$-ene due to steric hindrance,so its heat of combustion is higher. The given order is incorrect.$D$: The melting point depends on the symmetry of the molecule. The trans-isomer is more symmetrical and packs better in the crystal lattice,leading to a higher melting point. However,in the specific case of $1,2$-difluoroethene,the cis-isomer has a higher melting point due to its higher dipole moment and specific crystal packing. The given order is correct.

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